vocal formant shifts in Csound?

Hey,

I've not found out by searching on the net, but I'm interested in being able
to record my voice for microtonal music, and reasonably fool the ear into
thinking it's a female voice singing 2 octaves higher with post-processing.
In other words, avoiding the 'chipmmunk' effect. I hear that there is
software for this, but how might I do it using Csound or PD or Max or
something?

My goal--makeing Toby Twining like 'sketches' without hiring singers at all.

Best,
--
Aaron Krister Johnson
http://www.akjmusic.com
http://www.dividebypi.com

Aaron, I'm pretty sure that this is possible in Csound, but I can't really help as it gets into areas in which I have no experience. You might consider posing the question on the Csound mailing list itself: http://www.csounds.com/list/index.html

- Dave

Aaron K. Johnson wrote:
> Hey,
> > I've not found out by searching on the net, but I'm interested in being able > to record my voice for microtonal music, and reasonably fool the ear into > thinking it's a female voice singing 2 octaves higher with post-processing. > In other words, avoiding the 'chipmmunk' effect. I hear that there is > software for this, but how might I do it using Csound or PD or Max or > something?
> > My goal--makeing Toby Twining like 'sketches' without hiring singers at all.
> > Best,

Aaron,

{you wrote...}
>... and reasonably fool the ear into thinking it's a female voice singing >2 octaves higher with post-processing.

Whoa, 2 octaves is an awful long way to stretch without inducing some serious artifacts! There might be others out there, but one of the current algorithms/tools for this is MPEX2, which somebody licenses to various companies; I know that Sonar contains it. You can get much better pitch shifts than with previous technologies, but I doubt you'd be satisfied at that range. I think you are really talking about resynthesis at that point.

I bet some guy in a university somewhere has built a library for Csound for this kind of thing - maybe Chris Bailey knows?

Cheers,
Jon